It probably was for platform independence since the any system that has a /dev/urandom will use that as a source of entropy anyway [0]. If you know you'll be on a system with that and need more than one goroutine to use a random stream you probably should just open it yourself so that goroutines dont have to serialize their access. Although, I dont know what the system does to provide urandom so concurrent reads might not really work for that anyway. Seems like it'd be simple to test out if you're curious enough.
[0]
https://golang.org/src/crypto/rand/rand_unix.go--
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